As someone who used to do some GIS hacking in an office job[0] before I was a 'Software Developer/engineer' this is super cool.

[0] - Honestly some of the coolest stuff I ever got to do in it's own right. Building tools that could move data between AutoCAD, Microstation, and Google Earth while also importing other bits with metadata from Trimble units[1]. Also it was probably the most I ever used math in my entire career [2], so there's that.

[1] - I wound up finding a custom font maker, and one of our folks made a font library with the symbols, made it easy to write a parser too :D

[2] - One of those PDFs I always seem to wind up having floating on a hard drive is the USGS 'Map Projections, a working manual'. At one point I used it as a reference to implement a C# library to handle transforms between coordinate systems... alas it was internal.